<template>
  <div class="upload-file">
    <!-- :before-upload="handleBeforeUpload" -->
    <el-upload
      ref="upload"
      :action="uploadFileUrl"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      :auto-upload="true"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">选取文件</el-button>
      <!-- 上传提示 -->
      <div v-if="showTip" slot="tip" class="el-upload__tip">
        请上传
        <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
        <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group v-if="listType== 'text'" class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
      <li v-for="(file, index) in fileList" :key="file.uid" class="el-upload-list__item ele-upload-list__item-content">
        <el-link :href="file.url" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ file.fileName/*getFileName(file.name)*/ }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link :disabled="disabled" :underline="false" type="danger" @click="handleDelete(index)">删除</el-link>
        </div>
      </li>
    </transition-group>
    <!-- 显示文件类型图片 -->
    <div v-if="listType== 'picture'" class="showFile">
      <div
        v-for="(item, index) in fileList"
        :key="index"
        class="item"
        :title="item.name"
      >
        <!-- 放图片的盒子 -->
        <div class="imageBox">
          <img
            :src="
              imgType.includes(item.type) ? item.url
              : fileTypeKeys.includes(item.type) ? fileTypeIcon[item.type]
                :fileTypeIcon['tongyong']
            "
          >
          <!-- <img v-if="imgType.includes(item.type)" :src="item.url" :alt="item.name">
          <img v-else-if="fileTypeKeys.includes(item.type)" :src="fileTypeIcon[item.type]" :alt="item.name">
          <img v-else :src="fileTypeIcon['tongyong']" alt=""> -->
        </div>
        <!-- 文字 -->
        <div class="text">
          {{ item.fileName }}
        </div>
        <!-- 删除按钮 -->
        <div v-if="!disabled" class="icon" @click="handleDelete(index)">
          <el-button icon="el-icon-delete" circle />
        </div>
      </div>

      <!-- 下面四个item用于解决flex布局的位置错乱的问题 -->
      <div class="item clear" />
      <div class="item clear" />
      <div class="item clear" />
      <div class="item clear" />
      <div class="item clear" />
      <div class="item clear" />
      <div class="item clear" />
    </div>
  </div>
</template>

<script>

/**
 *
 *
 *    文件上传不要用 若依的（FileUpload/index）不用！
 *    使用本组件
 *
 *
 */
import { getToken } from '@/utils/auth'
import file_type_icon from '@/assets/images/file_type_icon/index'
export default {
  name: 'FileUpload',
  props: {
    // 值
    value: {
      type: Array,
      default() {
        return []
      }
    },
    // 数量限制
    limit: {
      type: Number,
      default: 5
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: null// 200
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['doc', 'xls', 'ppt', 'txt', 'pdf']
    },
    listType: {
      type: String,
      default: 'text' // text/picture
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    // 禁用功能
    disabled: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      uploadFileUrl: process.env.VUE_APP_BASE_API + '/file/upload', // 上传的图片服务器地址
      headers: {
        Authorization: 'Bearer ' + getToken()
      },
      fileList: [],
      tempIndex: 1,
      fileTypeIcon: file_type_icon,
      fileTypeKeys: Object.keys(file_type_icon),
      imgType: ['png', 'jpg', 'jpeg', 'bmp', 'gif', 'svg']
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  watch: {
    value: {
      immediate: true,
      handler(fileList) {
        this.fileList = fileList.map(item => {
          if (typeof item === 'string') {
            item = { name: item, url: item }
          }
          item.uid = item.uid || (Date.now() + this.tempIndex++)
          item.type = item.type || this.getFileType(item.name || item.fileName)
          return item
        })
      }
    }
  },
  methods: {
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType && this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        // if(this.fileType.includes('*')) {
        //   return true
        // }
        const isTypeOk = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
        if (!isTypeOk) {
          this.$message.error(`文件格式不正确, 请上传${this.fileType.join('/')}格式文件!`)
          return false
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      this.loading = this.$loading({
        lock: true,
        text: '上传中',
        background: 'rgba(0, 0, 0, 0.7)'
      })
      return true
    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传失败
    handleUploadError(err) {
      this.$message.error('上传失败, 请重试')
      this.loading.close()
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code == 200) {
        this.$message.success('上传成功')
        const fileType = this.getFileType(res.data.fileName)
        this.fileList.push({ name: res.data.fileName, url: res.data.url, fileName: res.data.fileName, type: fileType, size: res.data.size })
        this.$emit('input', this.listToString(this.fileList))
      }
      if (this.loading) this.loading.close()
    },
    getFileType(name) {
      if (typeof name !== 'string') return ''
      const last = name.lastIndexOf('.')
      return last > -1 ? name.slice(last + 1) : ''
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1)
      this.$emit('input', this.listToString(this.fileList))
    },
    // 获取文件名称
    // getFileName(name) {
    //   if (name.lastIndexOf('/') > -1) {
    //     return name.slice(name.lastIndexOf('/') + 1).toLowerCase()
    //   } else {
    //     return ''
    //   }
    // },
    // 对象转成指定字符串分隔
    listToString(fileList/* list, separator*/) {
      return fileList.map(e => {
        return {
          fileName: e.fileName,
          name: e.name,
          url: e.url,
          size: e.size
        }
      })
    //   let strs = ''
    //   separator = separator || ','
    //   for (const i in list) {
    //     strs += list[i].url + separator
    //   }
    //   return strs != '' ? strs.substr(0, strs.length - 1) : ''
    }
  }
}
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}

.showFile {
  width: 100%;
  padding-right: 20px;
//   margin-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  .item {
    width: 112px;
    height: 150px;
    // margin-top: 20px;
    transition: all 0.2s linear;
    cursor: pointer;
    position: relative;
    .imageBox {
      width: 100%;
      text-align: center;
      height: 100px;
      img {
        height: 100px;
      }
    }
    .text {
      text-align: center;
      margin-top: 5px;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .icon {
      width: 40px;
      height: 40px;
      position: absolute;
      right: 0;
      bottom: 0;
      left: 0;
      top: 0;
      margin: auto;
      display: none;
    }
    &:hover {
      background: rgba(0, 0, 0, 0.1);
      transition: all 0.2s linear;
    }
    &:hover .icon {
      display: block;
    }
  }

  .item.clear {
    border: none;
    height: 0;
    overflow: hidden;
    visibility: hidden;
  }
}
</style>
